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Volume, Freshwater, and Heat Fluxes Through Davis Strait, 2004–05*

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Volume, Freshwater, and Heat Fluxes Through Davis Strait, 2004–05* MARCH 2011 C U R R Y E T A L . 429 Volume, Freshwater, and Heat Fluxes through Davis Strait, 2004–05* B. CURRY AND C. M. LEE Applied Physics Laboratory, University of Washington, Seattle, Washington B. PETRIE Ocean Sciences Division, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada (Manuscript received 29 July 2010, in final form 25 October 2010) ABSTRACT Davis Strait volume [22.3 6 0.7 Sv (1 Sv [ 106 m3 s21); negative sign indicates southward transport], freshwater (2116 6 41 mSv), and heat (20 6 9 TW) fluxes estimated from objectively mapped 2004–05 moored array data do not differ significantly from values based on a 1987–90 array but are distributed dif- ferently across the strait. The 2004–05 array provided the first year-long measurements in the upper 100 m and over the shelves. The upper 100 m accounts for 39% (20.9 Sv) of the net volume and 59% (269 mSv) of the net freshwater fluxes. Shelf contributions are small: 0.4 Sv (volume), 15 mSv (freshwater), and 3 TW (heat) from the West Greenland shelf and 20.1 Sv, 27 mSv, and 1 TW from the Baffin Island shelf. Contempo- raneous measurements of the Baffin Bay inflows and outflows indicate that volume and freshwater budgets balance to within 26% and 4%, respectively, of the net Davis Strait outflow. Davis Strait volume and freshwater fluxes nearly equal those from Fram Strait, indicating that both are significant Arctic freshwater pathways. 1. Introduction affect western North Atlantic continental shelf ecosystems (Greene et al. 2008). Arctic waters flow into the North Atlantic through Davis Strait captures the CAA outflow after modifica- the Canadian Arctic Archipelago (CAA) and Fram tion during its transit through Baffin Bay to the Labrador Strait (Aagaard and Carmack 1989). Recent changes in Sea (Fig. 1a). Arctic Ocean waters, entering northern the Arctic including increased air temperatures (e.g., Baffin Bay through Nares Strait and Jones and Lancaster Overland et al. 2008), enhanced sea ice loss (e.g., Wang Sounds, flow southward along Baffin Island through Davis and Overland 2009), increased Canadian river discharge Strait as the broad, surface-intensified Baffin Island Cur- (De´ry et al. 2009), and ice-free CAA channels (Canadian rent (BIC; Tang et al. 2004; Cuny et al. 2005). Northward Ice Service; available online at http://ice-glaces.ec.gc.ca/) flow on the eastern side of Davis Strait consists of the fresh suggest potentially large changes in volume, freshwater, West Greenland Current (WGC) of Arctic origin on the and heat transports between the Arctic and North Atlantic shelf and warm, salty West Greenland Slope Current Oceans. Variability in freshwater export through Davis (WGSC) of North Atlantic origin on the slope. These Strait could impact North Atlantic deep convection (e.g., inflowing waters, modified during their cyclonic circula- Va˚ge et al. 2009), alter the strength of the Atlantic me- tion in Baffin Bay, join the BIC and exit western Davis ridional overturning circulation (Holland et al. 2001), and Strait at depths typically .400 m. The net Baffin Bay outflow combines CAA flows, river runoff, sea ice, and * Supplemental information related to this paper is available at the inputs from Greenland and the North Atlantic. The Journals Online Web site: http://dx.doi.org/10.1175/2010JPO4536.s1. smaller Fury and Hecla Strait component [0.1 Sv (1 Sv [ 106 m3 s21 5 31 536 km3 yr21) volume and 38 mSv Corresponding author address: Beth Curry, Applied Physics freshwater] of the CAA outflow bypasses Baffin Bay Laboratory, 1013 NE 40th St., Seattle, WA 98105. and enters the Labrador Sea through Hudson Strait E-mail: [email protected] (Straneo and Saucier 2008). DOI: 10.1175/2010JPO4536.1 Ó 2011 American Meteorological Society Unauthenticated | Downloaded 09/24/21 03:28 PM UTC 430 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 41 moorings (4 per shelf and 6 central moorings; Figs. 1b,c) north of the sill (640 m) at a maximum depth of 1040 m. Instrumentation measured velocity, temperature, and con- ductivity at 30 min and hourly intervals. On the Baffin Is- land shelf, a prototype iceberg-resistant mooring (IceCAT), consisting of a float and SBE37 MicroCAT inductively coupled to a bottom-mounted datalogger measured tem- perature and conductivity at 5-min intervals. Currents were resolved parallel and orthogonal to the array line (77.38); tidal variability was removed with a 34-h low-pass Butterworth filter and subsampled to obtain daily values; and missing data were filled by interpolation and extrapolation using archived data to produce full-depth temperature (T) and salinity (S;BIO;T and S data are available online at http://www.mar.dfo-mpo.gc.ca/science/ ocean/) and along-strait velocity (V) profiles at each moor- ing (see appendix A of online supplement). b. Objective mapping Objective analysis (OA; Bretherton et al. 1976) was used to construct daily variable (5observed value 2 mean value) maps of V, T,andS fields using a Gaussian covariance function. Correlations calculated from hy- drographic sections and mooring time series yielded horizontal decorrelation length scales of 20 (V)and 40 km (T and S). Slowly varying daily-mean fields were created using further low-passed data (10-day cutoff to reduce tidal and meteorological variability) and spatially averaged into domains defined by depth (0–150, 200–250, and 500 m) and location (e.g., the shelves and WGSC– BIC frontal zone). The mean and variable fields were mapped onto a regular, two-dimensional grid with 4-m cells at depths ,150 m and 10-m cells at depths .150 m at a horizontal resolution of 5 km (see appendix B of online supplement). c. Flux calculations Daily volume, freshwater, and heat fluxes were aver- aged to compute monthly and annual fluxes. The refer- FIG. 1. (a) General circulation in Baffin Bay and Davis Strait ence salinity (34.8, mean Arctic Ocean salinity; Aagaard (white arrows) noting the BIC, WGC, WGSC, and moored array (red and Carmack 1989), sea ice salinity (5), and temperature line). (b) Zoom panel of Davis Strait and 2004–05 (red squares) and (08C) were chosen to maintain consistency with Cuny 1987–90 (black squares) mooring sites. (c) Moored array instruments, depths, and locations. Blue crosses indicate SBE37 MicroCAT con- et al. (2005). Mooring deployment and recovery provided ductivity, temperature, and pressure recorders; green dots represent ,10 days of data in September, insufficient to compute RDI ADCPs; black dots denote Aanderaa RCM8 velocity, con- reliable flux estimates for that month. Monthly fluxes ductivity, and temperature recorders; and red dots denote Aanderaa for September 2005 were estimated as the average of RCM8 velocity and temperature recorders. Inset image shows a October 2004 and August 2005 values. close-up of the Baffin Island shelf instruments. d. Uncertainties 2. Data and methods Flux uncertainties were estimated as the sum of OA a. Data random error, standard error of the mean calculated A long-term monitoring program in Davis Strait began using the Student’s t distribution with 95% confidence in September 2004. The 2004–05 program included 14 limits, and maximum range of flux estimates obtained Unauthenticated | Downloaded 09/24/21 03:28 PM UTC MARCH 2011 C U R R Y E T A L . 431 FIG. 2. Objectively analyzed monthly mean (a) along-strait velocity, (b) salinity, and (c) temperature. Gray lines indicate moorings, white dots indicate instrument locations for each property, and the pink bars indicate areas along the moored array that are covered by sea ice 60% of the month. The 34.8 salinity contour (dashed black line) and the 27 kg m23 isopycnal (black line) are noted in (b). Mean salinities $ 34.8 were seen only in October. The boundaries of the four dominant water masses (see Fig. 3 for u–S characteristics) are shown for October in (c). Unauthenticated | Downloaded 09/24/21 03:28 PM UTC 432 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 41 FIG. 3. Davis Strait water masses defined using potential temperature (u) and S: AW (red ellipse; u # 18C; S # 33.7) present in the western strait at depths ,300 m, WGIW (blue ellipse; u . 28C; S . 34.1) along the WG slope, WGSW (green ellipse; u , 78C; S , 34.1), and TrW (magenta ellipse; u # 28C; S . 33.7) usually at depths .300 m. Water masses are illustrated using September 2004 (black squares) and September 2005 (gray circles) hydrographic data along the mooring line. using different approaches to compute the mean field. Baffin Island (Figs. 2b,c). Salinity increased ;0.4 from Additional uncertainties associated with the ice flux and December to March in the upper 200 m with local ice estimation of the shelf and 0–100-m salinities were added formation (;1.25 m) accounting for only ;0.1 of the in- to the freshwater flux uncertainty estimate. Sensitivity crease, with the remaining due to salt advection. The tests were performed to estimate flux variability asso- strong BIC–WGSC frontal zone, separating Arctic Water ciated with differences in mean field and sea ice flux. (AW) and transitional water (TrW) from West Green- land Irminger Water (WGIW), is evident over the slope. Maximum temperatures and salinities of the WGIW 3. Results and discussion occurred in autumn, decreased until April and remained a. Current and water mass structure nearly constant until August, consistent with advection from the south (M. Stein 2009, personal communication). Circulation during 2004–05 was dominated by north- Recirculated WGIW influenced the temperature of TrW, ward flow on the West Greenland (WG) shelf and slope but their temperature variations were not well correlated, and southward flow over the remaining strait with possibly due to variations in recirculation and mixing time weaker currents below 200 m (Fig.
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